Functions Of Electronic Trip Relay (Etr) Parts - Mitsubishi Electric AE-SW Series Instruction Manual

Functions of electronic trip relay (ETR) parts

< Function description of each part >
① ERR. LED, contact output
When any abnormality or setting failure is found in the
ETR, this provides a notification of the abnormal status.
When the power supply type is P3 ~ P5, contact output
is given between and
513
terminal block.
• Functional abnormality in ETR (microprocessor, H/W)
• Incorrect setting (mis-setting of Int/MCR)
• Abnormality in in-breaker wiring related to ETR
② RUN LED (ETR)
ETR indicates the operable state. If the control power
supply is applied, or when approx. 10% of the rated
current flows to the main circuit, the internal circuit is
activated, turning on this LED.
③ RUN LED (option setting module)
This indicates that the option setting module is in an
operable state.
If the control power supply is applied, or when approx.
10% of the rated current flows to the main circuit, the
internal circuit is activated, turning on this LED.
④ Trip cause indicator (LED, contact output)
The cause of a trip is indicated by LED. When the
power supply type is P3 ~ P5, a contact output is given
between (common) and
513
the control circuit terminal block.
PAL LED will blink when the current exceeds the pre-
alarm current setting (Ip), and will be lit after 1/2 of the
LTD time is passed. At this time, the contact output will
also be made.
②RUN LED
(ETR)
①ERR. LED
④Trip cause indicator
LED
⑤TAL LED
③RUN LED
(GFR)
④Trip cause indicator
LED
For the display (including measuring functions) and interface unit, see the separate instruction manual.
on the control circuit
574
Option
Option
, , , or on
524 534 544 554
Fig. 21-1 Example) WS1G1
⑤ TAL LED, contact output
The ETR temperature detector becomes operable when
a TAL sensor is installed. When the power supply type
is P3 ~ P5, a contact output is given between
on the control circuit terminal block. When the
564
temperature drops, the output will be reset. To retain the
output, use an external sequence.
⑥ MCR (Making-current release)
The setting can be switched between the instantaneous
current (INST) and MCR functional current (MCR). In the
MCR setting, INST characteristic is enabled from the
time of breaker closing (OFF to ON), and after closing,
the INST characteristic becomes disabled.
If specified at the time of ordering, an MCR switch is
built in to the breaker. When shipped from the factory,
this is set to the INST side.(Fig. 21-2)
⑦ RESET button
To reset the trip cause indicator (LED, contact output),
use the "RESET" button in front of ETR, or short-circuit
and on the control circuit terminal block for 0.5
RS1 RS2
seconds or longer.
(The power supply type P1 and P2 are not provided with
the function to reset from the control circuit terminal
block.)
There is also a function to temporarily lock LTD and STD
to test the INST characteristic by using a dedicated field
testing device. (For operating instructions, refer to the
instruction manual of the tester.)
Do not
set
⑦RESET
button
Option
513
Option
⑥MCR
Fig. 21-2
and
E-21